Effect of Al Film on the Electromagnetic Properties of Glass Fiber Reinforced Resin Matrix Composite

doi:10.11900/0412.1961.2017.00178

Acta Metall Sin

2017, Vol. 53

Issue (11): 1511-1520 DOI: 10.11900/0412.1961.2017.00178

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Effect of Al Film on the Electromagnetic Properties of Glass Fiber Reinforced Resin Matrix Composite

Yuqiu CHEN^1,², Yapei ZU¹, Jun GONG¹, Cao SUN¹(

), Chen WANG³

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Altair Engineering Software (Shanghai) Co., Ltd., Shanghai 200436, China

Cite this article:

Yuqiu CHEN, Yapei ZU, Jun GONG, Cao SUN, Chen WANG. Effect of Al Film on the Electromagnetic Properties of Glass Fiber Reinforced Resin Matrix Composite. Acta Metall Sin, 2017, 53(11): 1511-1520.

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Abstract

Metallic thin films have many properties that bulk metals do not possess, such as high impedance. Recently, increasing attention has been paid to high impedance surface in the design of antennas and absorbers. Metallic thin films used in composite materials can realize the perfect matching of electromagnetic wave in different materials. The use of metallic thin films in electromagnetic functional materials results in significant increase of the absorbing intensity and operating bandwidth. But it usually needs to pay a huge amount of manpower, material resources and a longer period of time to design excellent electromagnetic functional materials with metallic films. So it is greatly significant to understand clearly the electromagnetic influence of metallic film for designing excellent performance materials and saving costs by simulation software. Al film is a typical non-magnetic metal film. In this work, the electromagnetic reflectivity of Al films and glass fiber reinforced resin matrix composite had been studied. High frequency electromagnetic field calculation software FEKO was employed to calculate the reflection coefficient of the composites. The effect of composites' real part of permittivity ε_r, dielectric loss tangent tanδ_ε, permeability μ_r and magnetic loss tangent tanδ_μ on microwave reflectivity had been discussed. The equivalent electromagnetic parameters of glass fiber reinforced resin matrix composite had been obtained through a comparison between simulation and experimental results. Due to resonance phenomena of the embedded Al film in the glass fiber reinforced resin matrix composite with certain thickness, there is an optimum resistance value of Al film that makes the composite structure have minimum reflection. Through the calculation of Al film and glass fiber reinforced resin matrix composite with different structure, the thickness relationship between Al films in calculation and Al films prepared by magnetron sputtering had been obtained. According to the theory of transmission line, the resistance of resonance is analyzed by MATLAB. This method is also applicable to the resistance solution of the homogeneous metal films at any position in the composite or frequency selective surfaces. The equivalent electromagnetic parameters of Al film and glass fiber reinforced resin matrix composite in simulation had been ascertained, and the simulation results agree well with the experimental results.

Key words: Al film glass fiber reinforced resin matrix composite effective electromagnetic parameter simulation resonance resistance

Received: 09 May 2017

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	Yuqiu CHEN
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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00178 OR https://www.ams.org.cn/EN/Y2017/V53/I11/1511

Fig.1 Schematic of frequency selective surface unit

Fig.2 Simulation models of two kinds of composite structures (U, V, N represent the three vectors in workplane coordinate system, corresponding to X, Y, Z directions in the global coordinate system, respectively)
(a) metallic frequency selective surface and composite structure
(b) Al film and composite structure

Table 1 Dielectric properties of fiber, resin and its composites at 20 ℃, 10 GHz^[13]

Fig.3 ε_r and tanδ_ε of the composite

Fig.4 SEM image of the composite section

Fig.5 Reflectivity curves of composites with different ε_r

Fig.6 Reflectivity curves of composites with different tanδ_ε

Fig.7 Reflectivity curves of composites with different μ_r (μ_r—real part of magnetic permeability)

Fig.8 Reflectivity curves of composites with different tanδ_μ (tanδ_μ—magnetic loss tangent)

Fig.9 Reflectivity curves of calculated and test results of composites at the unit size of a=48 mm, c=7 mm (a) and a=40 mm, c=5 mm (b)

Fig.10 Curves of calculated and test reflectivities of 8 mm composite with an Al film in the cases of Al film being above the composite (a) and in the middle of the composite (b)

Fig.11 Simulation reflectivity curves of 8 mm composite with different Al films in thickness in the case of Al film being above the composite (a) and in the middle of the composite (b)

Fig.12 Metallic film and its corresponding dielectric composite structure (k—wave number in medium, d—dielectric layer thickness, Z₀—wave impedance of air, Z_d—wave impedance of dielectric, r—resistance)
(a) sketch of the structure
(b) transmission line equivalent circuit model of this structure

Fig.13 Resonant resistance (r) curve of 8 mm glass fiber reinforced plastic composite structure with Al film

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